06. Closest Numbers

#include <iostream>

using namespace std;

int main() {
    int length, diff = 2147483647;
    cin >> length;

    int* arr = new int[length];

    for (int i = 0; i < length; i++) {
        cin >> arr[i];
    }

    for (int i = 0; i < length; i++) {
        for (int j = i + 1; j < length; j++) {
            if (abs(arr[i] - arr[j]) < diff) {
                diff = abs(arr[i] - arr[j]);
            }
        }
    }

    cout << (length > 1 ? diff : 0) << endl;
    return 0;
}